1-Hydroxybenzotriazole → 3-(2,3,4,6-Tetra-O-acetyl-beta-D-glucopyranosyloxy)-4-[(4-{2-[1-benzyloxycarbonyl-1-(methyl)-ethylcarbamoyl]ethoxy}-2-methylphenyl)methyl]-5-isopropyl-1H-pyrazole

Participants

Reaction Steps

To a solution of 3-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyloxy)-4-{[4-(2-carboxyethoxy)-2-methylphenyl]methyl}-5-isopropyl-1H-pyrazole (0.14 g) in N,N-dimethylformamide (3 mL) were added benzyl 2-amino-2-methylpropionate hydrochloride (57 mg), 1-hydroxybenzotriazole (31 mg), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (60 mg) and triethylamine (0.087 mL), and the mixture was stirred at room temperature for 4 hours. The reaction mixture was poured into water, and the resulting mixture was extracted with ethyl acetate. The extract was washed with water and brine, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluent: dichloromethane/methanol=40/1-20/1) to give the title compound (0.15 g).

Provenance & Evidence